<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2018-06-21</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001145057</issuerCik>
        <issuerName>FORESCOUT TECHNOLOGIES, INC</issuerName>
        <issuerTradingSymbol>FSCT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001320652</rptOwnerCik>
            <rptOwnerName>Amadeus Capital Partners LTD</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O AMADEUS CAPITAL, SUITE 1, 2ND FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2>2 QUAYSIDE</rptOwnerStreet2>
            <rptOwnerCity>CAMBRIDGE</rptOwnerCity>
            <rptOwnerState>X0</rptOwnerState>
            <rptOwnerZipCode>CB5 8AB</rptOwnerZipCode>
            <rptOwnerStateDescription>UNITED KINGDOM</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001719734</rptOwnerCik>
            <rptOwnerName>Amadeus II 'D' GmbH &amp; Co KG</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O PE CONCEPTS VERWALTUNGS GMBH</rptOwnerStreet1>
            <rptOwnerStreet2>MOEHLSTR. 23 C/O BLLW</rptOwnerStreet2>
            <rptOwnerCity>MUNICH</rptOwnerCity>
            <rptOwnerState>2M</rptOwnerState>
            <rptOwnerZipCode>81675</rptOwnerZipCode>
            <rptOwnerStateDescription>GERMANY</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001719594</rptOwnerCik>
            <rptOwnerName>Amadeus II 'A'</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O AMADEUS CAPITAL, SUITE 1, 2ND FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2>2 QUAYSIDE</rptOwnerStreet2>
            <rptOwnerCity>CAMBRIDGE</rptOwnerCity>
            <rptOwnerState>X0</rptOwnerState>
            <rptOwnerZipCode>CB5 8AB</rptOwnerZipCode>
            <rptOwnerStateDescription>UNITED KINGDOM</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001719593</rptOwnerCik>
            <rptOwnerName>Amadeus II 'B'</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O AMADEUS CAPITAL, SUITE 1, 2ND FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2>2 QUAYSIDE</rptOwnerStreet2>
            <rptOwnerCity>CAMBRIDGE</rptOwnerCity>
            <rptOwnerState>X0</rptOwnerState>
            <rptOwnerZipCode>CB5 8AB</rptOwnerZipCode>
            <rptOwnerStateDescription>UNITED KINGDOM</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001719592</rptOwnerCik>
            <rptOwnerName>Amadeus II 'C'</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O AMADEUS CAPITAL, SUITE 1, 2ND FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2>2 QUAYSIDE</rptOwnerStreet2>
            <rptOwnerCity>CAMBRIDGE</rptOwnerCity>
            <rptOwnerState>X0</rptOwnerState>
            <rptOwnerZipCode>CB5 8AB</rptOwnerZipCode>
            <rptOwnerStateDescription>UNITED KINGDOM</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001719640</rptOwnerCik>
            <rptOwnerName>Amadeus EI L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O AMADEUS CAPITAL, SUITE 1, 2ND FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2>2 QUAYSIDE</rptOwnerStreet2>
            <rptOwnerCity>CAMBRIDGE</rptOwnerCity>
            <rptOwnerState>X0</rptOwnerState>
            <rptOwnerZipCode>CB5 8AB</rptOwnerZipCode>
            <rptOwnerStateDescription>UNITED KINGDOM</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001719658</rptOwnerCik>
            <rptOwnerName>Amadeus EII L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O AMADEUS CAPITAL, SUITE 1, 2ND FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2>2 QUAYSIDE</rptOwnerStreet2>
            <rptOwnerCity>CAMBRIDGE</rptOwnerCity>
            <rptOwnerState>X0</rptOwnerState>
            <rptOwnerZipCode>CB5 8AB</rptOwnerZipCode>
            <rptOwnerStateDescription>UNITED KINGDOM</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001719656</rptOwnerCik>
            <rptOwnerName>Amadeus IV Velocity Fund L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O AMADEUS CAPITAL, SUITE 1, 2ND FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2>2 QUAYSIDE</rptOwnerStreet2>
            <rptOwnerCity>CAMBRIDGE</rptOwnerCity>
            <rptOwnerState>X0</rptOwnerState>
            <rptOwnerZipCode>CB5 8AB</rptOwnerZipCode>
            <rptOwnerStateDescription>UNITED KINGDOM</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001719590</rptOwnerCik>
            <rptOwnerName>Amadeus II Affiliates Fund L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O THE CORPORATION TRUST COMPANY</rptOwnerStreet1>
            <rptOwnerStreet2>1209 ORANGE STREET</rptOwnerStreet2>
            <rptOwnerCity>WILMINGTON</rptOwnerCity>
            <rptOwnerState>DE</rptOwnerState>
            <rptOwnerZipCode>19801</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2018-06-21</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>150000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>29804</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnotes</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                    <footnoteId id="F5"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1797285</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnotes</value>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                    <footnoteId id="F5"/>
                    <footnoteId id="F6"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1198189</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnotes</value>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                    <footnoteId id="F5"/>
                    <footnoteId id="F7"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>838723</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnotes</value>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                    <footnoteId id="F5"/>
                    <footnoteId id="F8"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>39925</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnotes</value>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                    <footnoteId id="F5"/>
                    <footnoteId id="F9"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>119789</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnotes</value>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                    <footnoteId id="F5"/>
                    <footnoteId id="F10"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>488278</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnotes</value>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                    <footnoteId id="F5"/>
                    <footnoteId id="F11"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>553233</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnotes</value>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                    <footnoteId id="F5"/>
                    <footnoteId id="F12"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Represents a pro rata distribution, and not a purchase or sale, without additional consideration by Amadeus EI L.P. (&quot;Amadeus EI&quot;) to its limited partners and general partner, Amadeus EI General Partner LP (&quot;Amadeus EI GP&quot;).  The shares distributed to Amadeus EI GP were immediately distributed to its limited partners without additional consideration.</footnote>
        <footnote id="F2">The reported shares are held of record by Amadeus EI. Amadeus EI GP is the general partner of Amadeus EI.</footnote>
        <footnote id="F3">Amadeus General Partner LTD (&quot;Amadeus GP LTD&quot;) and Amadeus Capital GP LLP (&quot;Amadeus Capital GP&quot; and, together with Amadeus GP LTD, the &quot;Intermediate General Partners&quot;) are the general partners of each of the Direct General Partners (as defined in footnote 12 below). Amadeus Capital Partners Limited (&quot;Amadeus Limited&quot;) is the manager of each of the Amadeus Funds (as defined in footnote 12 below) and the Direct General Partners and has sole voting and dispositive power with respect to the shares held by the Amadeus Funds. The directors of Amadeus Limited (the &quot;Amadeus Directors&quot;) have delegated their voting and dispositive power with respect to the shares held by each of the Amadeus Funds to a committee comprised of more than three members (the &quot;Amadeus Committee&quot;).</footnote>
        <footnote id="F4">Each of the members of the Amadeus Committee share voting and dispositive power with respect to the shares held by the Amadeus Funds. Each of Amadeus Limited, the other Amadeus Funds, the Direct General Partners, the Intermediate General Partners, the Amadeus Directors and members of the Amadeus Committee disclaim beneficial ownership of these securities and this report shall not be deemed an admission that any of them is the beneficial owner of such securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interests therein.</footnote>
        <footnote id="F5">All of the shares of the Issuer held by the Amadeus Funds are subject to a voting agreement (as described in the Issuer's Registration Statement on Form S-1 filed with the United States Securities and Exchange Commission (File No. 333-220767)) pursuant to which the Issuer's Chief Executive Officer holds an irrevocable proxy with, under certain circumstances, voting control over such shares.</footnote>
        <footnote id="F6">The reported shares are held of record by Amadeus II 'A' (&quot;Amadeus A&quot;). Amadeus II General Partner LP (&quot;Amadeus II GP&quot;) is the general partner of Amadeus A.</footnote>
        <footnote id="F7">The reported shares are held of record by Amadeus II 'B' (&quot;Amadeus B&quot;). Amadeus II GP is the general partner of Amadeus B.</footnote>
        <footnote id="F8">The reported shares are held of record by Amadeus II 'C' (&quot;Amadeus C&quot;). Amadeus II GP is the general partner of Amadeus C.</footnote>
        <footnote id="F9">The reported shares are held of record by Amadeus II 'D' GmbH &amp; Co KG (&quot;Amadeus GmbH&quot;). Amadeus II GP is the general partner of Amadeus GmbH.</footnote>
        <footnote id="F10">The reported shares are held of record by Amadeus II Affiliates Fund L.P. (&quot;Affiliates Fund&quot;). Amadeus II GP is the general partner of Affiliates Fund.</footnote>
        <footnote id="F11">The reported shares are held of record by Amadeus IV Velocity Fund L.P. (&quot;Velocity Fund&quot;). Amadeus IV Velocity GP LP (&quot;Amadeus Velocity GP&quot;) is the general partner of Velocity Fund.</footnote>
        <footnote id="F12">The reported shares are held of record by Amadeus EII L.P. (&quot;Amadeus EII&quot; and, together with each of Amadeus A, Amadeus B, Amadeus C, Amadeus GmbH, Affiliates Fund, Velocity Fund and Amadeus EI, the &quot;Amadeus Funds&quot;). Amadeus EII General Partner LP (&quot;Amadeus EII GP&quot; and together with each of Amadeus II GP, Amadeus Velocity GP and Amadeus EI GP, the &quot;Direct General Partners&quot;) is the general partner of Amadeus EII.</footnote>
    </footnotes>

    <remarks>This report on Form 4 is the first of two reports relating to the same transactions and is filed to enable all joint filers to gain access to the EDGAR filing system.</remarks>

    <ownerSignature>
        <signatureName>/s/ Anne Glover, Director of Amadeus Capital Partners Limited, the Manager of Amadeus II 'A'</signatureName>
        <signatureDate>2018-07-09</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Anne Glover, Director of Amadeus Capital Partners Limited, the Manager of Amadeus II 'B'</signatureName>
        <signatureDate>2018-07-09</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Anne Glover, Director of Amadeus Capital Partners Limited, the Manager of Amadeus II 'C'</signatureName>
        <signatureDate>2018-07-09</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Anne Glover, Director of Amadeus Capital Partners Limited, the Manager of Amadeus II 'D' GmbH &amp; Co KG</signatureName>
        <signatureDate>2018-07-09</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Anne Glover, Director of Amadeus Capital Partners Limited, the Manager of Amadeus II Affiliates Fund L.P.</signatureName>
        <signatureDate>2018-07-09</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Anne Glover, Director of Amadeus Capital Partners Limited, the Manager of Amadeus EI L.P.</signatureName>
        <signatureDate>2018-07-09</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Anne Glover, Director of Amadeus Capital Partners Limited, the Manager of Amadeus EII L.P.</signatureName>
        <signatureDate>2018-07-09</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Anne Glover, Director of Amadeus Capital Partners Limited, the Manager of Amadeus IV Velocity Fund L.P.</signatureName>
        <signatureDate>2018-07-09</signatureDate>
    </ownerSignature>
</ownershipDocument>
